Volume estimation of the Mont Éboulé Rockslide in Québec, Canada

Catherine Cloutier, Jacques Locat, Michel Jaboyedoff

In the proceedings of: GeoOttawa 2017: 70th Canadian Geotechnical Conference; 12th joint with IAH-CNC

Session: Geohazards II - Rockslides and Avalanches

ABSTRACT: A set of aerial laser scan (ALS) data of The Mont Éboulé rockslide allows for detailed investigation of this slide, possibly the largest rockslide in the Precambrian shield in the province of Québec. The rockslide located in the Sainte-Marguerite Valley, which is part of the seismically active Saguenay graben, has been studied by Locat et al. in 1997. We propose a new volume estimation based on pre-failure topography construction, which yields a much larger volume than the one estimated for the debris. This finding indicates that the rockslide scarp might be the result of more than one rockslide event. The rockslide is then compared to other scars recently found in the Precambrian shield, which are used to emphasized that large rockslides (>500 000 m³) can occur in the Canadian shield which inherits its landform from past glaciations.

RÉSUMÉ: Un scan laser aéroporté (ALS) acquis dans le secteur du glissement rocheux du Mont Éboulé précambrien dans la province de Québec. Ce glissement, localisé dans la vallée de la rivière Sainte-Marguerite se trouve dans la zone sismique active du graben du Saguenay et a été étudié en 1997 par Locat et al. (1997). Nous proposons une nouvelle estimation du volume, basée sur la construction de la topographie pré-rupture, dont le résultat est beaucoup plus grand que la quantité de débris estimée. avancée glaciaire ou tout juste après la déglaciation de la région. dont la morphologie fut façonnée par les glaciers.

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Cite this article:
Catherine Cloutier; Jacques Locat; Michel Jaboyedoff (2017) Volume estimation of the Mont Éboulé Rockslide in Québec, Canada in GEO2017. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2017Paper474,author = Catherine Cloutier; Jacques Locat; Michel Jaboyedoff,title = Volume estimation of the Mont Éboulé Rockslide in Québec, Canada,year = 2017}